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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/11543.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/11543.cc
new file mode 100644
index 00000000..2f6cf298
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/11543.cc
@@ -0,0 +1,153 @@
+// Copyright (C) 2003, 2009
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// .
+
+// 27.8.1.4 Overridden virtual functions
+
+// { dg-require-fileio "" }
+
+#include
+#include
+#include
+
+struct MyState
+{
+};
+
+struct MyCharTraits : std::char_traits
+{
+ typedef std::fpos pos_type;
+ typedef MyState state_type;
+};
+
+namespace std
+{
+ template <>
+ class codecvt :
+ public locale::facet, public codecvt_base
+ {
+ public:
+ typedef char intern_type;
+ typedef char extern_type;
+ typedef MyState state_type;
+
+ explicit codecvt(size_t refs = 0)
+ : locale::facet(refs) { }
+
+ result out(state_type& state, const intern_type* from,
+ const intern_type* from_end, const intern_type*& from_next,
+ extern_type* to, extern_type* to_limit,
+ extern_type*& to_next) const
+ { return do_out(state, from, from_end, from_next,
+ to, to_limit, to_next); }
+
+ result unshift(state_type& state, extern_type* to, extern_type* to_limit,
+ extern_type*& to_next) const
+ { return do_unshift(state, to, to_limit, to_next); }
+
+ result in(state_type& state, const extern_type* from,
+ const extern_type* from_end, const extern_type*& from_next,
+ intern_type* to, intern_type* to_limit,
+ intern_type*& to_next) const
+ { return do_in(state, from, from_end, from_next,
+ to, to_limit, to_next); }
+
+ int encoding() const throw()
+ { return do_encoding(); }
+
+ bool always_noconv() const throw()
+ { return do_always_noconv(); }
+
+ int length(state_type& state, const extern_type* from,
+ const extern_type* end, size_t max) const
+ { return do_length(state, from, end, max); }
+
+ int max_length() const throw()
+ { return do_max_length(); }
+
+ static locale::id id;
+
+ protected:
+ virtual ~codecvt();
+
+ virtual result do_out(state_type&, const intern_type* from,
+ const intern_type*, const intern_type*& from_next,
+ extern_type* to, extern_type*,
+ extern_type*& to_next) const
+ {
+ from_next = from;
+ to_next = to;
+ return noconv;
+ }
+
+ virtual result do_in(state_type&, const extern_type* from,
+ const extern_type*, const extern_type*& from_next,
+ intern_type* to, intern_type*,
+ intern_type*& to_next) const
+ {
+ from_next = from;
+ to_next = to;
+ return noconv;
+ }
+
+ virtual result do_unshift(state_type&, extern_type*, extern_type*,
+ extern_type*&) const
+ { return noconv; }
+
+ virtual int do_encoding() const throw()
+ { return 1; }
+
+ virtual bool do_always_noconv() const throw()
+ { return true; }
+
+ virtual int do_length(state_type&, const extern_type* from,
+ const extern_type* end, size_t max) const
+ {
+ size_t len = end - from;
+ return std::min(max, len);
+ }
+
+ virtual int do_max_length() const throw()
+ { return 1; }
+ };
+
+ locale::id codecvt::id;
+
+ codecvt::~codecvt()
+ { }
+}
+
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+
+ std::locale loc(std::locale::classic(),
+ new std::codecvt);
+ std::basic_filebuf fb;
+ fb.pubimbue(loc);
+ fb.open("tmp_11543", std::ios_base::out);
+ VERIFY( fb.is_open() );
+ MyCharTraits::pos_type pos = fb.pubseekoff(0, std::ios_base::beg);
+ VERIFY( pos != MyCharTraits::pos_type(MyCharTraits::off_type(-1)) );
+ fb.close();
+}
+
+int main()
+{
+ test01();
+ return 0;
+}